Buy an electrical multi-meter for like $10 and figure out using that which wire is which.
The wiring could be set up in a number of ways though, common earth or common live with individual switched supply / neutral. or it could have live / neutral and an earth.
My instinct tells me the black will be neutral in both cases. Red was "traditional" live so I'd expect that to be live.
just get the multi-meter on it and figure it out.
English
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Thanks, and I updated my original post to include the directions that came with the fan.
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Edited by Dredwerkz: 11/20/2017 1:55:12 AMBefore you do any of these, turn all mains breakers off and never guess an earth line. You can turn a metal casing into 110v if you do. As you've got your neutral at the fan, (black+blue) and your neutral on the roof, the black, and it says to hook up the white together then I'd suggest to wire it all up like that and try it. If there is no earth, the worst you'll do is hook up live to live or neutral to neutral, meaning it just won't work. As for the loose red, (with the breaker OFF at the mains box) wrap it up in electrical tape so there's no chance it's going to touch anything, cutting off the conductor down to the insulation helps. Assuming you don't find out you need it because the white at the box isn't the live line.